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DANIEL T. ROBINSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND HOWARD TILDEN, OF SAME PLAGE.

FLOUR-SIFTER.

Specitication forming part of Letters Patent No. 51,901., dated January 2, 1866.

To all whom it may concern:

Be it known that I, DANIEL T. ROBINSON, ot Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Flour-Sitters 5 and I do hereby declare that the following is a full and exact description of the same, reference being 'had to the accompanyin g drawings, and to the letters and iigures marked thereon.

Figure I is a perspective view. Fig. II is a vertical section, showing the relative position of the horizontal bars.

My improvement in our-sifters is intended to be used both as a sieve and a scoop, and is so constructed that in the operation of sifting the motion is vibrating, and very nearly resembles that of a common sieve, while at the same tim( a series of bars or rods prevent the iour from caking, and keep it in a light condition, ready for passing through the wirenetting.

The scoop A B O L D has the handle E upon the top, in front of which there is a rockerjoint, F, to which is soldered the curved handle or lever Gr H I, the part Gr H being above the scoop and the part H I within it.

The sieve or wire net-work Q B occupies nearly the whole of the bottom ot' the scoop, and is soldered to the frame M N O P. Its curvature from front to rear is circular, the center of the circle being at the fulcrum or joint F. The bottom of the scoop, from L to D, is struck with the same sweep, so that the sieve may play freely back and forth upon the narrow rim or border left at the outer edge of the bottom of the scoop.

To the rim ot' the frame several small dat bars are afxed, as shown at S S S. They extend across the breadth of the sitter, and are slightly' elevated above the net-work or sieve Q R.' There are also several iixed bars, T T', parallel with the bars S, soldered to the upright side of the scoop. A connecting rod or wire, J, is jointed to the bent lever at l, its outer end, K, being bent at right angles and slipped through a hole made in one of the transverse bars, S.

Suitable stops or knobs are aXed to the scoop to govern the distance of the vibration of the sieve, or it may be stopped by thebars T.

To operate the sifter, the handle E is held with the left hand, while the right hand grasps the bent lever at G H. As this is moved back and forth alternately a vibratory motion is given to the sieve, which plays on the curved rim before mentioned, and causes the iiour to pass through the wire-netting. One series of the bars being fixed and the other movable, the tlour is kept in motion above the net-work as the bars pass each other, thus causing the lower stratum to be light and in suitable condition to pass readily through the sieve.

I am aware that a scoop and sitter have been heretofore used, as in the common coal-sitter having a perforated bottom, and in patents issued to Earnshaw and others.

Vhat I claim, and desire to secure by Let-v ters Patent, is

The combination of the scoop, its vibrating sieve, and the double series of transverse bars, arranged with reference to each other, substantially as herein described.

DANIEL T. ROBINSON.

In presence oti- JOHN M. BATGHELDER. EBEN P. GRAY.

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